Anthropic tests its next model under Claude Opus 5.5

Claude Opus 5.5 appears to be routing some users to a new, unannounced model. Early outputs on X look remarkable. Is it Opus 5.6 or Fable 5.5?

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2026-10-12 13:11 · TestingCatalog AI News
Anthropic tests its next model under Claude Opus 5.5

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